Methodology

Clear numbers. Clear limits.

We use two different government datasets for two different questions. The Census tells us how many living people reported a name. Social Security records tell us when that first name was given to babies.

The headline count

First- and last-name counts come from the U.S. Census Bureau’s Frequently Occurring Names in the 2020 Census, released in 2026. These are aggregated national estimates. They are not individual records and cannot be used to identify a person.

The public files include first and last names occurring at least 100 times. When a name is absent, we report “fewer than 100,” not zero. Census estimates have privacy-protecting statistical noise, so small differences should not be treated as exact.

The full-name estimate

No complete public U.S. directory counts first-and-last-name combinations. When both component names are available, we estimate the combination as:

first-name count × last-name count ÷ 331,449,281

The denominator is the official 2020 U.S. resident population. This assumes first and last names occur independently. In reality, language, ancestry, migration, geography, and family patterns create correlations. The estimate is useful for scale, but it is not a directory count or proof that a particular number of people exists.

Popularity history

Yearly history comes from the Social Security Administration’s national baby-name files, covering 1880 through 2025. The data are based on Social Security card applications and count births, not people alive today.

SSA suppresses a name-sex-year combination with fewer than five records. Because of that rule, rare-name totals and state totals are incomplete. We use the series to show timing, peak year, five-year momentum, and birth-era distribution—not to claim a current living population.

Sex and demographic aggregates

The 2020 Census name release includes national count distributions by sex and by broad race and Hispanic-origin categories. We display these as aggregate context only. A name does not determine an individual’s sex, race, ethnicity, ancestry, nationality, or culture.

Rank and rarity

National rank is the rank published by the Census Bureau within its first-name or surname table. “One in X” divides the 2020 U.S. population by the published name count. Plain-language rarity labels are orientation aids:

  • Very common: at least 1 in 250 people
  • Common: at least 1 in 1,000
  • Distinctive: at least 1 in 5,000
  • Rare: at least 1 in 25,000
  • Very rare: less frequent than 1 in 25,000

Updates and reproducibility

The checker currently uses the 2020 Census name release and SSA records through 2025. A reproducible build script downloads the source files and regenerates the static search index. We will refresh it when either agency publishes a new national release.